2x +3y = 43.200, dan 3x+5y= 90.000 dit 2x +2y=? jawab ya

Eliminasi X
2x + 3y = 43,200 dikali 3
3x + 5y = 90,000 dikali 2
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6x + 9y. = 129,600
6x + 10y = 180,000
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-y = -50,400 dikali -1
y = 50,400

Subtitisi y ke 2x + 3y = 43,200
2x + 3y = 43,200
2x + 3(50,400) = 43,200
2x + 151,200 = 43,200
2x = 43,200 - 151,200
2x = -108,000
x = -54,000

Jadi
2x + 2y =
2(50,400) + 2(-54,000) =
100,800 + (-108,000)= -7,200